Bimetal Thermometer

What is a Bimetal Thermometer?  
Bimetal Thermometer: In a bimetal thermometer the sensor uses materials that have two dissimilar temperature coefficient of linear expansion.  The dial displays the temperature depending on the expansion rate of the 2 dissimilar metals. Bimetal Thermometer Temperature Sensor
   

Bimetal Thermometers (Download Full Catalogue)  
 

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